Welcome to the latest entry in our Bonus Round series, wherein we tell you all about the new Android games of the day that we couldn't get to during our regular news rounds. Consider this a quick update for the dedicated gamers who can't wait for our bi-weekly roundups, and don't want to wade through a whole day's worth of news just to get their pixelated fix. Today we've got a runner game with some Portal inspiration, another runner that should please physics buffs, and a game that delivers exactly what it promises. Without further ado:

Rock Runners

If Portal and an endless runner had a baby, it would be Chillingo's Rock Runners. And that includes Portal's excellent physics - you're going to have to use gravity and momentum in this game to reach the end of the sci-fi platforming levels. It's not just a one trick pony, either, as demonstrated by creative use of swinging ledges and twitchy jumps. Graphics and sound look great, and there is a lot of personality in the characters and environments. International readers, here's the "rest of world" version.

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Take control of an energetic, running, jumping, swinging runner in this hugely entertaining action platform game. Leap across puddles of radioactive goo, swing over gaps using your light-beam grapple, and zip through portals on your way to completing each stage. Sprint through over 140 levels, each one with it's own set of challenges to accomplish. Collect gems to unlock upgrades and new playable characters!

Boson X

A unique premise can go a long way, and that's why this endless runner set in a particle accelerator is in this list. You play a tiny man who, for some reason, is trying to find particles at faster and faster speeds. Simple but attractive 3D graphics and a breakneck pace should please anyone who enjoys a challenge, and physics enthusiasts will get a kick out of the kooky story. The game costs two bucks on Android, but you can download it on Windows, Mac, or Linux for free.

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Quantum jump from Planck to Planck and reach critical velocity in Boson X, a rotational runner from Mu & Heyo. Build up speed inside a massive particle accelerator and generate high-energy collisions to discover strange new particles. Use precise timing and fast reflexes to navigate a subatomic world where floors and ceilings don't exist. Will you be fast enough to find the elusive Boson X?

An Alien with a Magnet

Combine the planet-hopping nature of Super Mario Galaxy, the odd physics of They Need To Be Fed, and the inexplicably explosive barrels of Donkey Kong Country, and you get An Alien With A Magnet. This simple 2D puzzler tasks you with finding the best route through an asteroid field littered with gems, occasionally using the titular magnet to cling to planetoids. Single-touch gameplay and 45 levels make this a perfect time-killer for quick and casual sessions.

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Take control of our Alien and his spaceship and get him back to his home planet using just a magnet. Get ready to explore multiple galaxies using this magnet to orbit around colorful and unique planets to get to your goal. But beware of dark holes, challenging puzzles, multiple locks and asteroids blocking your path in space. Besides the adventure mode, you can also play an extra bonus mode which will keep you busy for even more hours of fun gameplay.